From: Kees Cook <kees@kernel.org>
To: LKML <linux-kernel@vger.kernel.org>, Dennis Chen <dechen@redhat.com>
Cc: Kees Cook <kees@kernel.org>,
x86@kernel.org, Christoph Hellwig <hch@infradead.org>,
Borislav Petkov <bp@alien8.de>
Subject: Re: [PATCH] lkdtm: Make UNSET_SMEP built-in-only and unexport native_write_cr4()
Date: Wed, 14 Oct 2026 13:11:35 -0700 [thread overview]
Message-ID: <179200869545.3133508.11783463903727237796.b4-ty@kernel.org> (raw)
In-Reply-To: <20261014175859.30863-1-dechen@redhat.com>
On Wed, 14 Oct 2026 13:58:59 -0400, Dennis Chen wrote:
> native_write_cr4 should not be exported to modules. Commit 21953ee5013d
> ("x86/cpu: Export native_write_cr4() only when CONFIG_LKTDM=m")
> restricted the export somewhat, but native_write_cr4() is still exposed
> to all GPL-compatible modules when CONFIG_LKDTM=m.
>
> UNSET_SMEP is the only module user of native_write_cr4(). Restrict
> the test to CONFIG_LKDTM=y and remove the export. When LKDTM is
> built as a module, report XFAIL for UNSET_SMEP.
>
> [...]
Applied to for-next/hardening, thanks!
[1/1] lkdtm: Make UNSET_SMEP built-in-only and unexport native_write_cr4()
https://git.kernel.org/kees/c/e2cd253cb31b
Take care,
--
Kees Cook
next prev parent reply other threads:[~2026-10-14 20:11 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-14 17:58 Dennis Chen
2026-10-14 20:11 ` Kees Cook [this message]
2026-10-15 5:55 ` Christoph Hellwig
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